OpenStack-Ansible Galera server

Ansible role to install and configure a Galera cluster powered by MariaDB

Default variables

# Set the package install state for distribution packages
# Options are 'present' and 'latest'
galera_server_package_state: "latest"

galera_cluster_members: "{{ groups['galera_all'] }}"
galera_server_bootstrap_node: "{{ galera_cluster_members[0] }}"
galera_ignore_cluster_state: false
galera_upgrade: false

galera_wsrep_node_name: "{{ inventory_hostname }}"
galera_cluster_name: openstack_galera_cluster

# This variable will prevent the galera_cluster_name from changing unintentionally on a running cluster.
# To intentionally change the galera_cluster_name set this variable to True
galera_force_change_cluster_name: False

# The galera server-id should be set on all cluster nodes to ensure
#  that replication is handled correctly and the error
#  "Warning: You should set server-id to a non-0 value if master_host is
#   set; we will force server id to 2, but this MySQL server will not act
#   as a slave." is no longer present.
# galera_server_id: 0

# These are here to stub out the internal ROLE API.
#  if these are used they should be set within the
#  distro specific variable files found in vars/
galera_server_distro_package_pins: []
galera_debconf_items: []
galera_server_percona_distro_packages: []


galera_existing_cluster: true
galera_running_and_bootstrapped: false

galera_monitoring_user: monitoring
galera_monitoring_user_password: ""
galera_root_user: root

# WARNING: This option is deprecated and will be removed in v12.0
galera_gcache_size: 1024M

galera_max_heap_table_size: 32M
galera_tmp_table_size: 32M

galera_file_limits: 65535
galera_wait_timeout: 3600

## innodb options
galera_innodb_buffer_pool_size: 4096M
galera_innodb_log_file_size: 1024M
galera_innodb_log_buffer_size: 128M

## wsrep configuration
galera_wsrep_address: "{{ ansible_host }}"
galera_wsrep_cluster_address: "{% if galera_cluster_members | length > 1 %}{% for host in galera_cluster_members %}{{ hostvars[host]['ansible_host'] }}{% if not loop.last %},{% endif %}{% endfor %}{% endif %}"
galera_wsrep_node_incoming_address: "{{ galera_wsrep_address }}"
galera_wsrep_slave_threads: "{{ (ansible_processor_vcpus | int > 0) | ternary (ansible_processor_vcpus, 2) }}"
galera_wsrep_retry_autocommit: 3
galera_wsrep_debug: 0
galera_wsrep_sst_method: xtrabackup-v2
galera_wsrep_provider_options:
  - { option: "gcache.size", value: "{{ galera_gcache_size }}" }
galera_wsrep_sst_auth_user: "root"
galera_wsrep_sst_auth_password: "{{ galera_root_password  }}"

# xtrabackup parallel/compression/sync threads
galera_xtrabackup_threads: 4

galera_pip_packages:
  - MySQL-python
  - pycrypto

# Galera slow/unindexed query logging
galera_slow_query_logging: 0
galera_unindexed_query_logging: 0

## Tunable overrides
galera_my_cnf_overrides: {}
galera_cluster_cnf_overrides: {}
galera_debian_cnf_overrides: {}

# Set the max connections value for galera. Set this value to override the
# computed value which is (100 x vCPUs). If computed, the lowest value throughout
# the cluster will be used which is something to note if deploying galera on different
# hardware.
# galera_max_connections: 500

using_mysql_init: no

Required variables

To use this role, define the following variables:

galera_root_password: secrete

Example playbook

- name: Install Galera server
  hosts: galera_all
  user: root
  roles:
    - { role: "galera_server" }
  vars:
    galera_root_password: secrete